低对比度油层测录井综合识别方法研究与应用——以珠江口盆地陆丰油田为例
Research and application of the log-based comprehensive identification method for low-contrast oil layers:A case study of the Lufeng oilfield in the Pearl River Mouth Basin
刘伟男 1管耀 1刘道理 1石磊 1宋伟1
作者信息
- 1. 中海石油(中国)有限公司 深圳分公司,广东 深圳 518054
- 折叠
摘要
在储层评价中流体性质的准确识别是一个十分关键的问题.然而在珠江口盆地陆丰地区古近系低孔低渗储层,由于高阻水层的存在,使得油水层在常规测录井响应上对比度小,给油水层的准确识别带来困难.本文在明确低对比度油层储层特征与成因分析的基础上,针对低孔低渗储层中气测响应值受钻速、孔隙度等因素影响较大的问题,推导了Flair气测响应方程,建立Flair录井响应值校正方法.基于不同流体性质组分特征存在差异,采用Flair气测曲线构建新含油指数与含水率指数;同时采用伽马概率分布函数表征地化色谱图谱特征,提取形状因子与尺度因子进行图谱特征描述.基于敏感性参数,建立基于特征参数的流体性质识别图版.实际应用表明,综合测录井资料的流体性质识别方法具有较好的效果,识别符合率达 91.3%,具有较好的推广价值.
Abstract
The accurate identification of fluid properties is critical for reservoir evaluation.However,for the Paleogene low-porosity and low-permeability reservoirs in the Lufeng area,Pearl River Mouth Basin,the low contrast between oil and water layers in conventional logs due to the presence of high-resistivity water layers complicates the identification of oil and water layers.This study first ascertained the reservoir characteristics and genetic analysis of low-contrast oil layers.Then,it developed the Flair gas logging response equation and the Flair logging response correction method,aiming to overcome the challenge that gas logging response values of low-porosity and low-permeability reservoirs are significantly influenced by factors such as drilling rate and porosity.Given the differences in the properties and components of various fluids,this study constructed new oil-bearing and water-content indices using Flair gas logging curves.Moreo-ver,this study characterized the geochemical chromatogram using a gamma probability distribution function and extracted the shape and scale factors to describe the chromatogram characteristics.Based on sensitivity parameters,this study plotted the characteristic parame-ter-based fluid property identification chart.The practical application shows that the log-based comprehensive fluid property identifica-tion method can yield satisfactory effects,achieving a compliance rate of 91.3%.Therefore,this method can be popularized.
关键词
低对比度油层/残余油/Flair录井校正/地化色谱图谱/伽马分布/流体识别Key words
low-contrast oil layer/residual oil/Flair log correction/geochemical chromatogram/gamma distribution/fluid identification引用本文复制引用
基金项目
中国海洋石油有限公司重大科技项目(十四五)(KJGG2022-0406)
中海石油(中国)有限公司深圳分公司生产性科研项目(SCKY-2024-SZ-14)
出版年
2024
国家科技期刊平台
NSTL
万方数据